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我的应用程序运行良好，但现在我必须测试一个通过 LocationManager 获取位置的类，所以我决定在清单中激活模拟位置：

<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION"
    tools:ignore="ProtectedPermissions" />

我还在模拟器（开发设置）上激活了模拟位置。这是我使用 LocationManager 的方法：

public Location getCurrentLocation() {
    try {
        LocationManager locationManager = (LocationManager) ctx.getSystemService(Context.LOCATION_SERVICE);
        if (ActivityCompat.checkSelfPermission(ctx, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            return null;
        }
        return locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
    } catch (NullPointerException e) {
        return null;
    }
}

这是我的测试课：

public class LocationTest {

Context context;
@Rule
public GrantPermissionRule permissionRule = GrantPermissionRule.grant(Manifest.permission.ACCESS_FINE_LOCATION);

@Before
public void init() {
    context = InstrumentationRegistry.getInstrumentation().getTargetContext();

    Location mockLocation = new Location(android.location.LocationManager.GPS_PROVIDER);
    android.location.LocationManager locationManager = (android.location.LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
    locationManager.addTestProvider(android.location.LocationManager.GPS_PROVIDER, false, false,
            false, false, true, true, true, 0, 5);
    locationManager.setTestProviderEnabled(android.location.LocationManager.GPS_PROVIDER, true);

    mockLocation.setLatitude(-20.000);
    mockLocation.setLongitude(10.000);
    mockLocation.setAltitude(10);
    mockLocation.setBearing(0);
    mockLocation.setAccuracy(5);
    mockLocation.setSpeed(0);
    mockLocation.setTime(System.currentTimeMillis());
    mockLocation.setElapsedRealtimeNanos(System.nanoTime());

    locationManager.setTestProviderStatus(android.location.LocationManager.GPS_PROVIDER, LocationProvider.AVAILABLE, null, System.currentTimeMillis());
    locationManager.setTestProviderLocation(android.location.LocationManager.GPS_PROVIDER, mockLocation);
}

@After
public void tearDown() {
    android.location.LocationManager locationManager = (android.location.LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
    locationManager.removeTestProvider(android.location.LocationManager.GPS_PROVIDER);
}

@Test
public void getCurrentLocationTest() {
    LocationClass locClass = new LocationClass(context);
    Location loc = locClass.getCurrentLocation();
    assertFalse(loc == null);
}

}

出于某种原因，“返回 locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);” 在 getCurrentLocation() 中始终返回 null（不抛出异常，并且授予权限）。

当我启动我的应用程序时它可以工作，但是当我尝试在测试中模拟位置，甚至在不模拟位置的情况下尝试它时，LocationManager 没有找到任何位置（虽然激活模拟位置有效 -> 没有抛出异常，只是经理赢了'不检测任何位置）。

我什至可以模拟仪表测试的位置并使用 getLastKnownLocation 返回它吗？我该怎么做才能让它发挥作用？

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